Please solve 7b

Dear Student

The question posted by you is not very clear. Please find the solution below. If the values are exactly same, please change the values according to your question.
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Let the man initially at a distance‘s’ from the hills. The sound travels 2s distance in time 5s.

Then, speed of sound:

At the second time he travels 320m towards the hills and fires a gun at that point. Now, the distance between the man and the hills is (s-320) m. Sound travels 2(s-320) distance in time 3s.

Then, the speed of sound:

Compare the above two expressions,

Now, substitute the value of s in first expression:

Regards

-1

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